Rotate a vector around another point.
CL_Vec2<int >& CL_Vec2< int >::rotate( const CL_Vec2 < int > & hotspot, const CL_Angle & angle); static CL_Vec2<int > CL_Vec2< int >::rotate( const CL_Vec2 < int > & vector, const CL_Vec2 < int > & hotspot, const CL_Angle & angle);